Nikon Prostaff vs. Redfield Revenge

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Open circles do not work as well as marks

They sure work well on my Nikon. Once you "tune" your BDC to a specific load it is very accurate. For example. I took my best AR load and tuned it to the BDC circles. I put 4"x4" rocks at 100-400 yards. If you hold the correct circle at each distance,(in this case only the first and second were needed) you will hit the rock every time. The key is learning to set your 100 yard zero correctly for a specific load.